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City of Arden Hills Proposal QTB210666 February 21, 2025 Page 2 Depending on access requirements, ground conditions or potential utility conflicts, our field crew may alter the exploration locations from those proposed to facilitate accessibility. Staking We will stake prospective subsurface exploration locations and obtain surface elevations at those locations using GPS (Global Positioning System) technology. For purposes of linking the GPS data to an appropriate reference, we request that you provide CAD files indicating location/elevation references appropriate for this project, or give us contact information for the consultant that might have such information. Utility Coordination Prior to drilling or excavating, we will contact Gopher State One Call and arrange for notification of the appropriate utility vendors to mark and clear the exploration locations of public underground utilities. You, or your authorized representative, are responsible to notify us before we begin our work of the presence and location of any underground objects or private utilities that are not the responsibility of public agencies. ROW Permit and Work Hours We will obtain a right-of-way (ROW) permit through the City of Arden Hills (City) right-of-way department prior to beginning our fieldwork. We assume the City will waive permit fees as we will be completing the work for them. Prior to commencing with field work. We assume that the City will not require a work hour restriction for this work (i.e., an 8:00 AM to 4:00 PM normal work hour will apply). Pavement Coring We propose to perform 23 pavement cores for the project.19 will be in road ROW (at our proposed boring locations presented below) and 4 on the trail improvements. The coring will be performed with a 6-inch diamond-toothed core barrel fitted on a mechanically operated rotary drill. The coring will extend down through the existing bituminous section. Upon completion of each core, we will extend a manually operated hand auger through the aggregate base section to a depth of 2 to 4 feet into the underlying subgrade. The thickness of the cores will be measured to the nearest 1/4-inch, and the aggregate base will be measured to the nearest 1-inch (depending on the underlying soil type and past mixing of the aggregate layer). If groundwater/frost is encountered, we will note their presence on the boring logs. We will photograph the pavement cores and attach in a core photo log. The pavement cores will be retained for up to 60 days, unless otherwise noted. Figure 1 in our soil borings section shows the proposed pavement coring locations which includes the trail locations. Soil Borings We propose to drill 19 standard penetration test (SPT) borings for the project to nominal depths of 10 feet below existing grade surface. We will perform standard penetration tests at 2 1/2-foot vertical intervals to a depth of about 10 feet.